Finding ID | Version | Rule ID | IA Controls | Severity |
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V-256569 | PHTN-30-000100 | SV-256569r887381_rule | Medium |
Description |
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ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages modify the host's route table and are unauthenticated. An illicit ICMP redirect message could result in a man-in-the-middle attack. |
STIG | Date |
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VMware vSphere 7.0 vCenter Appliance Photon OS Security Technical Implementation Guide | 2023-02-21 |
Check Text ( C-60244r887379_chk ) |
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At the command line, run the following command: # /sbin/sysctl -a --pattern "net.ipv4.conf.(all|default|eth.*).accept_redirects" Expected result: net.ipv4.conf.all.accept_redirects = 0 net.ipv4.conf.default.accept_redirects = 0 net.ipv4.conf.eth0.accept_redirects = 0 If the output does not match the expected result, this is a finding. Note: The number of "ethx" lines returned is dependent on the number of interfaces. Every "ethx" entry must be set to "0". |
Fix Text (F-60187r887380_fix) |
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At the command line, run the following command: # for SETTING in $(/sbin/sysctl -aN --pattern "net.ipv4.conf.(all|default|eth.*).accept_redirects"); do sed -i -e "/^${SETTING}/d" /etc/sysctl.conf;echo $SETTING=0>>/etc/sysctl.conf; done # /sbin/sysctl --load |